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Subsequent Events (Details) - Ipsen Collaboration - Collaboration Arrangement - Subsequent Event $ in Thousands	Jul. 30, 2021 USD ($) agreement
Subsequent Event [Line Items]
Number of collaboration programs \| agreement	2
Non-refundable upfront payment received for research agreement	$ 20,000
Pre-clinical milestone payment amount	5,000
Development and regulatory milestone payment amount	180,000
Commercial milestone payment amount	762,000
Collaboration agreement, licensing fees incurred	3,000
Option Exercise Period after the Selection
Subsequent Event [Line Items]
Collaboration option exercise fee	10,000
Option Exercise Period that begins after the first Option Exercise Period
Subsequent Event [Line Items]
Collaboration option exercise fee	$ 25,000